JIF Jurnal Ilmu Fisika最新文献

{"title":"Pengaruh Pemberian Ekstrak Jintan Hitam (Nigella sativa) terhadap Kadar MDA dan SOD Hepar Tikus (Rattus norvegicus) yang Diinduksi Piroxicam","authors":"Septi Kurniasari","doi":"10.20527/flux.v18i2.9993","DOIUrl":"https://doi.org/10.20527/flux.v18i2.9993","url":null,"abstract":"Piroxicam merupakan salah satu obat anti inflamasi non steroid (OAINS) yang berpotensi menyebabkan kerusakan sel pada organ hepar. Kerusakan hepar ditandai dengan tingginya kadar MDA ( Malondialdehyde ) dalam darah. Kerusakan sel hepar dapat diminimalisir oleh senyawa antioksidan. Efektivitas senyawa antioksidan dapat ditunjukkan dengan adanya kadar SOD ( Superoksida Dismutase ) dalam darah. Penelitian ini bertujuan untuk menganalisis pengaruh pemberian ekstrak jintan hitam ( Nigella sativa ) terhadap kadar MDA dan SOD hepar tikus ( Rattus norvegicus ) yang diinduksi Piroxicam. Penelitian ini menggunakan 80 ekor tikus jantan dan dibagi menjadi 3 kelompok, yaitu kontrol negatif, Piroxicam negatif dan Piroxicam positif. Pemberian ekstrak jintan hitam diberikan secara oral dengan dosis 2 gr/kgBB; 3 gr/kgBB; 4 gr/kgBB; 5 gr/kgBB dan 6 gr/kgBB, sedangkan dosis Piroxicam yang digunakan adalah 1 gr/kg BB dan 3 gr/kg BB. Hasil penelitian menunjukkan bahwa semakin banyak dosis Piroxicam yang diberikan, maka semakin tinggi kadar MDA dan semakin rendah kadar SOD. Seiring dengan penambahan dosis ekstrak jintan hitam, maka kadar MDA menjadi berkurang dan kadar SOD meningkat.","PeriodicalId":52720,"journal":{"name":"JIF Jurnal Ilmu Fisika","volume":"63 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82186287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pemetaan Potensi Kerentanan Gempabumi Pada Kota Bengkulu Menggunakan Data Mikrotremor dan Metode Analytical Hierarchy Process","authors":"Arif Ismul Hadi, M. Farid, Refrizon Refrizon, Budi Harlianto, Nurul Hudayat, Malik Krisbudianto","doi":"10.20527/flux.v18i2.9479","DOIUrl":"https://doi.org/10.20527/flux.v18i2.9479","url":null,"abstract":"ABSTRAK- Kota Bengkulu merupakan daerah yang sangat rawan terhadap ancaman gempabumi. Salah satu upaya mengurangi dampak bencana gempabumi adalah melakukan analisis potensi tersebut berdasarkan data mikrotremor dan metode pembobotan statistik. Penelitian ini bertujuan memetakan dan menganalisis daerah-daerah yang rentan mengalami ancaman bahaya gempabumi. Penelitian ini dilakukan menggunakan data sekunder dan survei lapangan. Data sekunder bersumber dari penelitian-penelitian terkait, sedangkan data survei lapangan berupa data mikrotremor menggunakan metode Horizontal to Vertical Spectral Ratio (HVSR). Alat yang digunakan untuk survei lapangan berupa broadband seismometer PASI Gemini-2 triaxial geophone dengan natural freq . 2 Hz ± 10%, berat 2 kg (s.n.: 12/004). Akusisi data lapangan dilakukan selama 30 menit (360.000 samples ) per titik pengukuran dengan sampling rate 5 ms (200 Hz). Selanjutnya, tumpangsusun hasil pengolahan data sekunder dan lapangan menggunakan metode pembobotan statistik Analytical Hierarchy Process (AHP), sehingga diperoleh peta potensi kerentanan gempabumi di wilayah studi. Berdasarkan hasil analisis yang ditunjukkan dalam peta kerentanan gempabumi di daerah Kota Bengkulu dalam penelitian ini, Kecamatan Gading Cempaka, Kecamatan Singaranpati, Kecamatan Selebar, sebagian kecil Kecamatan Ratu Agung, dan Kecamatan Muara Bangkahulu adalah daerah yang mempunyai potensi kegempaan tinggi, sedangkan Kecamatan Selebar adalah daerah yang mempunyai potensi kegempaan rendah. Oleh karena itu untuk daerah berisiko tinggi perlu lebih diwaspadai dan perlu perencanaan pembangunan yang mengacu kepada standar risiko bencana. ABSTRACT − Bengkulu City is an area that is very prone to earthquake threats. One of the method to reduce the impact of an earthquake disaster is to conduct a potential analysis based on microtremor data and statistical weighting methods. This study aims to map and analyze the areas have the vulnerability to experience an earthquake hazard. This study was conducted using secondary data and field surveys. Secondary data comes from related studies, while field survey data is in the form of microtremor data using the Horizontal to Vertical Spectral Ratio (HVSR) method. The instrument used for the field survey was a broadband seismometer PASI Gemini-2 triaxial geophone with natural freq. is 2 Hz ± 10%, weight is 2 kg (s.n .: 12/004). Field data acquisition was carried out for 30 minutes (360,000 samples) per observation point with a sampling rate of 5 ms (200 Hz). Furthermore, the overlay of the results of secondary and field data processing uses the statistical weighting method of Analytical Hierarchy Process (AHP), in order to obtain a map of potential the seismic vulnerability in the study area. Based on the results of the analysis shown in the seismic vulnerability map in the Bengkulu City area in this study, Gading Cempaka Sub-district, Singaranpati Sub-district, Selebar Sub-district, a small part of Ratu Agung Sub-dist","PeriodicalId":52720,"journal":{"name":"JIF Jurnal Ilmu Fisika","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83657045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analisis Tingkat Kekeringan Lahan Gambut di Kalimantan Selatan Berdasarkan Data Citra Landsat 8 OLI/TIRS","authors":"Kartini Sri Astuti, Ichsan Ridwan, Sudarningsih Sudarningsih","doi":"10.20527/flux.v18i2.9480","DOIUrl":"https://doi.org/10.20527/flux.v18i2.9480","url":null,"abstract":"ABSTRAK –Kekeringan merupakan kondisi lahan di suatu daerah yang mengalami kekurangan pasokan air dalam jangka panjang, mulai dari beberapa bulan hingga tahun. Kesatuan Hidrologis Gambut merupakan kesatuan ekosistem gambut yang sangat penting dalam pengendalian kebakaran hutan dan lahan. Kalimantan Selatan memiliki ekosistem gambut yang harus dilindungi, sehingga kerusakan lahan gambut akibat kekeringan dapat diminimalisir. Penelitian untuk menganalisis tingkat kekeringan lahan gambut berdasarkan data citra Landsat 8 OLI/TIRS dan data KHG. Penginderaan jauh dan Sistem Informasi Geografis (SIG) digunakan dalam penelitian ini untuk menggambarkan kondisi lahan dalam bentuk pemetaan. Citra Landsat 8 OLI/TIRS yang digunakan adalah citra perekaman tahun 2015 dan 2018 dengan 3 parameter yaitu: curah hujan TRMM, indeks vegetasi (NDVI) dan suhu permukaan tanah (LST) yang menghasilkan tingkat kekeringan TVDI. TVDI dibagi menjadi 5 kelas: basah, agak basah, normal, agak kering, dan kering. Hasil pengolahan data dalam penelitian ini adalah peta tingkat kekeringan lahan gambut di Kalimantan Selatan yang memiliki TVDI tahun 2015 = (LST - (- 2,46 * NDVI + 23,57)) / (57,02-6,07 * NDVI) dengan tingkat kekeringan basah 179.095,55 hektar, tingkat kekeringan agak basah 45.130,09 hektar, tingkat kekeringan normal 12,02 hektar, tingkat kekeringan agak kering 1,47 hektar. TVDI tahun 2018 = (LST - (- 2,16 * NDVI + 23,68)) / (60,53-7,47 * NDVI) dengan tingkat kekeringan basah 194.798,46 hektar, tingkat kekeringan agak basah 46.042, 39 hektar, tingkat kekeringan normal adalah 14,02 hektar, tingkat kekeringan agak kering 5,99 hektar, dan tingkat kekeringan 4,57 hektar. Kata Kunci : Kesatuan Hidrologi Gambut, Sistem Informasi Geografis, Indeks Vegetasi (NDVI), Suhu Permukaan Tanah (LST), Tingkat Kekeringan TVDI ABSTRACT –Drought is the condition of the land in an area that experiences a shortage of water supply in the long term, ranging from several months to years. Peat Hydrological Unit is a unitary peat ecosystem which is very important in controlling forest and land fires. South Kalimantan has a peat ecosystem that must be protected, so that damage to peatlands due to drought can be minimized. Research to analyze the level of dryness of peatlands based on Landsat 8 OLI / TIRS imagery data and PHU data. Remote sensing and Geographical Information System (GIS) were used in this study to describe land conditions in the form of mapping. The Landsat 8 OLI / TIRS imagery used is the 2015 and 2018 image recording with 3 parameters, namely: TRMM rainfall, vegetation index (NDVI) and soil surface temperature (LST) which resulted in TVDI dryness levels. TVDI is divided into 5’classes: wet, slightly wet, normal, slightly dry, and dry. The results of the data processed in this study are a map of the level of dryness of peatlands in South Kalimantan which has TVDI in 2015 = (LST - (- 2.46 * NDVI + 23.57)) / (57.02-6.07 * NDVI) with a wet dryness level of 179,095.55 hectares, a sligh","PeriodicalId":52720,"journal":{"name":"JIF Jurnal Ilmu Fisika","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80380199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pengukuran Kejenuhan Oksigen Terlarut pada Air menggunakan Dissolved Oxygen Sensor","authors":"Risky Via Yuliantari, Dwi Novianto, Muhali Alex Hartono, Teguh Rahayu Widodo","doi":"10.20527/flux.v18i2.9997","DOIUrl":"https://doi.org/10.20527/flux.v18i2.9997","url":null,"abstract":"Kualitas air ditentukan oleh jumlah kandungan oksigen terlarut yang terdapat dalam air. Salah satu parameter kualitas air adalah oksigen terlarut. Oksigen terlarut atau Dissolved Oxygen (DO) dibutuhkan oleh semua makhluk hidup di bumi untuk proses respirasi , proses penghasil energi melalui pertukaran zat pada proses pertumbuhan dan perkembangbiakan. Kualitas air yang baik ditentukan berdasarkan kandungan oksigen terlarut dalam air yang tinggi. Untuk itu perlu adanya pengukuran untuk mengetahui kandungan oksigen terlarut dalam air, metode yang digunakan adalah metode elektrokimia.  Metode tersebut dilakukan secara langsung untuk menentukan oksigen terlarut menggunakan alat Dissolved Oxygen Sensor dengan  memperhatikan suhu dan salinitas sampel. Tipe sensor yang digunakan untuk memonitoring kadar oksigen terlarut yaitu Gravity Analog Dissolved  Oxygen Sensor  SKU SEN0237 yang dihubungkan dengan mikrokontroler arduino nano dan probe yang berisi NaOH 0,5 mol/L. Setelah mikrokontroler arduino nano dan probe terhubung dilakukan pengukuran dengan menentukan kejenuhan oksigen terlarut dalam air. Pengukuran dimulai pada detik pertama dengan nilai DO 8,25 mg/L, beranjak naik pada detik ke tiga puluh lima dengan nilai DO 10,08 mg/L, kemudian mulai stabil pada detik ke enam puluh satu dengan nilai DO 14,21 mg/L. Keadaan nilai DO stabil menandakan bahwa oksigen terlarut dalam air sudah mulai jenuh, menandakan bahwa Gravity Analog Dissolved Oxygen Sensor  SKU SEN0237 dapat digunakan untuk menentukan kualitas air dalam pemenuh kebutuhan seperti kebutuhan medis , makanan, minuman, dan sistem akuakultur maupun akuaponik.","PeriodicalId":52720,"journal":{"name":"JIF Jurnal Ilmu Fisika","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77541071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimation of Raindrop Size Distribution Parameters Using Lightning Data over West Sumatra","authors":"F. Salma, M. Marzuki, H. Hashiguchi, F. Nauval","doi":"10.25077/jif.13.2.92-100.2021","DOIUrl":"https://doi.org/10.25077/jif.13.2.92-100.2021","url":null,"abstract":"In situ observations of raindrop size distributions (DSDs) are still limited, especially in the tropics. Therefore, this study develops an alternative method to calculate DSD parameters by utilizing lightning data from the World-Wide Lightning Location Network (WWLLN) observation. DSD data was obtained from Parsivel's observations in the equatorial regions of Indonesia, i.e., Kototabang (100.32◦E, 0.20◦S, 865 m above mean sea level/ASL), Padang (100.46°E, 0.915°S, 200 m ASL), and Sicincin (100.30°E, 0.546°S, 134 m ASL). A gamma distribution parameterized the DSD. Three analysis domains were examined, with a grid of 0.1° x 0.1°, 0.5° x 0.5°, and 1° x 1°.  We examined the possibility to calculate the near-instantaneous DSD parameter, so three short time intervals, namely, one, five and ten minutes, were used. The results showed that the number of lightning strokes does not adequately correlate with DSD parameters. This is observed in all time intervals and analysis domains. Thus, the use of lightning data to calculate DSD parameters is not possible for short time interval of DSD (near instantaneous DSD). However, lightning data can estimate the average DSD parameters for an average time of more than one hour, as recommended by previous studies.","PeriodicalId":52720,"journal":{"name":"JIF Jurnal Ilmu Fisika","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47685094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analisis Anomali Magnetik dalam Penentuan Struktur Geologi dan Litologi Bawah Permukaan sebagai Manifestasi Panas Bumi Di Panyabungan Selatan Sumatera Utara","authors":"Ratni Sirait","doi":"10.20527/FLUX.V18I2.7402","DOIUrl":"https://doi.org/10.20527/FLUX.V18I2.7402","url":null,"abstract":"ABSTRAK- Tujuan dari penelitian ini adalah untuk mengetahui struktur geologi bawah permukaan di kawasan panas bumi di Panyabungan Selatan, menentukan litologi bawah permukaan, serta mengetahui jenis batuan sebagai reservoir yang baik dalam manifestasi panas bumi. Adapun teknik yang digunakan untuk menganalisis data adalah pengambilan data,  pengolahan data, koreksi harian, koreksi IGRF serta interpretasi kualitatif dan kuantitatif. Berdasarkan hasil penelitian didapatkan bahwa struktur geologi bawah permukaan pada penampang AA adalah rekahan naik dengan nilai suseptibilitas -0,9910 cgs merupakan batu gamping dolomitan, suseptibilitas 0,6500 cgs merupakan batu andesit, suseptibilitas 0,3360 cgs merupakan batu sabak dan suseptibilitas 0,1030 cgs merupakan batu serpih. Sedangkan struktur geologi pada penampang BB adalah rekahan turun dengan nilai suseptibilitas 0,3210 cgs merupakan batu sabak, suseptibilitas 0,8250 cgs merupakan batu gamping dolomitan, suseptibilitas 0,5100 cgs merupakan batu andesit, suseptibilitas 0,0530 cgs merupakan batu serpih, suseptibilitas 0,1340 cgs merupakan batu pasir dan suseptibilitas 0,2540 cgs merupakan batu varian. Batuan yang berfungsi sebagai reservoir yang baik dalam manifestasi panas bumi adalah batu gamping dolomitan. KATA KUNCI: Geomagnetik, Struktur Geologi, Litologi, Suseptibilitas ABSTRACT - The purpose of this research is to determine the subsurface geological structure in the geothermal area in Panyabungan Selatan, to determine subsurface lithology, and to know the type of rock as a good reservoir in geothermal manifestations. The techniques used to analyze the data were data collection, data processing, daily corrections, IGRF corrections and qualitative and quantitative interpretations. Based on the results, it is found that the subsurface geological structure in the AA section is an upward fracture with a susceptibility value of -0.9910 cgs is dolomite limestone, 0.6500 cgs susceptibility is andesite, 0.3360 cgs susceptibility is slate and 0.1030 cgs susceptibility is rock flakes. While the geological structure in the BB section is a descending fracture with a susceptibility value of 0.3210 cgs is slate, 0.8250 cgs susceptibility is dolomitan limestone, 0.5100 cgs susceptibility is andesite, 0.0530 cgs susceptibility is shale, 0,1340 cgs susceptibility is sandstone and the susceptibility of 0.2540 cgs is variant rock. The Rocks is function as good reservoirs in geothermal manifestations are dolomitic limestone. KEYWORDS: Geomagnetic, Geological Structure, Lithology, Suseptibility","PeriodicalId":52720,"journal":{"name":"JIF Jurnal Ilmu Fisika","volume":"62 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85562694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Desain Steam Boiler Pembangkit Listrik Tenaga Biomassa Skala Kecil Menggunakan Software Autodesk Inventor 2017","authors":"Ahmad Jaya, Anas Muliadin, I. Darmawan, Titien Andriani, Nova Aryanto, Muhammad Hidayatullah","doi":"10.20527/FLUX.V18I2.10273","DOIUrl":"https://doi.org/10.20527/FLUX.V18I2.10273","url":null,"abstract":"ABSTRAK - Peningkatan konsumsi energi listrik tidak diimbangi dengan ketersediaan sumber energi fosil yang selama ini digunakan sebagai bahan bakar oleh mayoritas pembangkit listrik di Indonesia, sehingga memunculkan permasalahan keamanan ketersediaan energi listrik. Salah  satu  cara mengatasi permasalahan tersebut adalah dengan pemanfaatan Energi Baru Terbarukan dari limbah pertanian yang digunakan sebagai bahan bakar Pembangkit Listrik Tenaga Biomassa (PLTBm). Pulau Sumbawa salah satu daerah yang memiliki potensi biomassa limbah tongkol jagung yang melimpah yang dapat dimanfaatkan sebagai bahan bakar PLTBm skala kecil maupun skala besar dengan cara pembakaran langsung. Penelitian ini menggunakan data dari Dinas Pertanian dan Perkebunan NTB tahun 2018 sebagai referensi untuk mengetahui potensi limbah tongkol jagung,  dikarenakan jagung  di pulau Sumbawa dijual pipilan, maka tongkol jagung hanya dibuang begitu saja. Oleh karena itu diperlukan perencanaan membangun PLTBm untuk memanfaatkan potensi tongkol jagung yang ada  di pulau Sumbawa tersebut. Penelitian ini merancang desain struktur sebuah PLTBm skala kecil  bahan bakar tongkol jagung menggunakan software Autodesk Inventor 2017. Hasil rancangan desain struktur PLTBm pada penelitian ini sudah memenuhi standar keamanan untuk dilakukan pembangunan PLTBm secara riil berdasarkan hasil simulasi Computer Aided Engineering (CAE) yang telah dilakukan menggunakan Finite Element Analysis (FEA), dari hasil simulasi didapatkan nilai safety factor minimum adalah 1,26 ul dan maximum 15 ul . KATA KUNCI : Autodesk Inventor 2017; Desain PLTBm; FEA; Simulasi CAE ABSTRACT - The increase in electricity consumption is not matched by the availability of fossil energy sources that have been used as fuel by the majority of power plants in Indonesia, which raises the security problem of the availability of electrical energy. One of the ways to overcome this problem is by utilizing New and Renewable Energy from agricultural waste which is used as fuel for Biomass Power Plant (PLTBm). Sumbawa Island is an area that has the potential for abundant corn cobs biomass which can be used as fuel for small and large scale PLTBm by direct combustion. This study uses data from the NTB Agriculture and Plantation Office in 2018 as a reference to determine the potential for corn cobs waste, because corn on the island of Sumbawa is sold as pipilan, so corn cobs are just thrown away. Therefore a plan is needed to build a PLTBm to take advantage of the potential of the corn cobs on the island of Sumbawa. This study designed the structural design of a small-scale PLTBm for corn cobs using Autodesk Inventor 2017 software. The results of the PLTBm structural design in this study have met the safety standards for real PLTBm construction based on the results of Computer Aided Engineering (CAE) simulations that have been done Finite Element Analysis (FEA), from the simulation results obtained the minimum safety factor value is 1.26 ul and ","PeriodicalId":52720,"journal":{"name":"JIF Jurnal Ilmu Fisika","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80832676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Citric Acid on Electrochemical Properties of Liquid Electrolytes","authors":"N. M. Noor, Saiyidah Nafisah Saidin, Nur Hani Ra’il, N. N. Mobarak","doi":"10.25077/JIF.13.2.80-91.2021","DOIUrl":"https://doi.org/10.25077/JIF.13.2.80-91.2021","url":null,"abstract":"Effect of citric acid as plasticizer on the electrochemical properties of liquid electrolyte has been studied. Liquid electrolyte was prepared by dissolving citric acid in 1% acetic acid with presence of lithium nitrate salt. Liquid electrolyte is characterized using a conductivity meter to measure the ionic conductivity value. Computer simulation of Density Functional Theory (DFT) with B3LYP/6-31G ++ (d, p) basic set was performed to identify the dominant functional group of citric acid when interact with lithium salt. Increasing the weight of citric acid has increased the ionic conductivity up to 44.89 mS/cm with an optimum weight of 4 g, while the ionic conductivity increases up to 43.00 mS/cm when the percentage of lithium nitrate salt increases up to 30%. The ionic conductivity increases as the salt percentage increases due the interaction between salt and functional group of citric acid. Based on computer simulation of DFT,  the dominant functional group in citric acid that interact with lithium salt are carboxylic acid group which is located in the middle of the citric acid chain causing lithium ions to be more likely interact with citric acid.","PeriodicalId":52720,"journal":{"name":"JIF Jurnal Ilmu Fisika","volume":"13 1","pages":"80-91"},"PeriodicalIF":0.0,"publicationDate":"2021-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41554108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Monosaccharides and Disaccharides Type on Ionic Conductivity of Liquid Electrolyte Based Lithium Iodide","authors":"Nur Hani Ra’il, N. N. Mobarak","doi":"10.25077/JIF.13.2.70-79.2021","DOIUrl":"https://doi.org/10.25077/JIF.13.2.70-79.2021","url":null,"abstract":"Liquid electrolyte was prepared by dissolving glucose, fructose, sucrose and lactose separately with different percentage of lithium iodide (10 – 35%) in aqueous solution of 1% acetic acid. Liquid electrolyte is characterized using conductivity meter to determine ionic conductivity. Computer simulations of Density Functional Theory (DFT) was used to identify the dominant functional groups on monomers such as glucose, sucrose, fructose and lactose when interact with the lithium salt by using B3LYP/6-31G ++ (d, p) basis set. The highest ionic conductivity for monosaccharide is glucose at 28.20 mS/cm while for disaccharide is lactose at 28.00 mS/cm with percentage of salt at 35 wt.%. Ionic conductivity increases when concentration of salt increase because there is an interaction between salt with functional groups of compounds. Based on computer simulations of DFT, interaction between lithium with compounds can be occurred due to negative electrostatic potential on the molecule. Electronegativity value of oxygen atom in glucose (-0.562e) and lactose (-0.567e) higher than fructose (-0.559e) and sucrose (-0.515e). Functional groups that are dominant to interact when interact with lithium salt are O-15 for glucose and O-17 for lactose due to the shorter bond length, the stronger energy attraction between functional groups with lithium.","PeriodicalId":52720,"journal":{"name":"JIF Jurnal Ilmu Fisika","volume":"13 1","pages":"70-79"},"PeriodicalIF":0.0,"publicationDate":"2021-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42601214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of (Mg1.0Zn0.0)TiO3+4 wt%Bi2O3 Ceramics for Application as Resonator in Dielectric Resonator Oscillator Circuit","authors":"Lailatul Izza, F. U. Ermawati","doi":"10.25077/JIF.13.2.62-69.2021","DOIUrl":"https://doi.org/10.25077/JIF.13.2.62-69.2021","url":null,"abstract":"MgTiO3-based ceramics have potential applications in telecommunications systems at microwave frequencies, such as resonators in dielectric resonator oscillator (DRO) circuits. This paper reports the results of (Mg1.0Zn0.0)TiO3+4wt% Bi2O3 (abbreviated MZT0+4wt%Bi2O3) ceramic fabrication to assess its potential to be used as a resonator in the DRO circuit. We characterized its structure, microstructure, and bulk density. The addition of 4wt%Bi2O3 to MZT0 crystalline powder was carried out via ball-mill. The milled powder was compacted using a die press to obtain pellets. All pellets were sintered at 1100ºC for 4, 6, and 8 h. Ceramic structures of the 4 and 6 h holding time consists of MgTiO3 phase (94.33±2.68) and (95.34±1.95)% molar respectively, while the rest phase was TiO2. The 8-h ceramic structure comprises (96.11±2.94) % molar MgTiO3 accompanied by Mg2TiO5 and TiO2. The ceramics' microstructure consists of a cluster of grains with an average diameter of 1.32-2.24 μm and pores. Bulk density decreases with the increase of sintering holding time. The DRO characterization records a resonance signal each at 5.207, 5.005, and 5.121GHz with power approaching 0 dBm, suggesting that the MZT0+4wt%Bi2O3 ceramics can be used as a resonator in the DRO circuit working in microwave frequencies, especially at 5.0-5.2GHz.","PeriodicalId":52720,"journal":{"name":"JIF Jurnal Ilmu Fisika","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47870931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}